Abstract

Nucleate boiling experiments on heating surface of constant wall temperature were performed using R113 for almost saturated pool boiling conditions. A microscale heater array and Wheatstone bridge circuits were used to maintain a constant wall temperature condition of heating surface and to measure the heat flow rate with high temporal and spatial resolutions. Bubble images during the bubble growth were taken as 5000 frames per second using a high-speed CCD camera synchronized with the heat flow rate measurements. The bubble growth behavior was analyzed using the new dimensionless parameters for each growth regions to permit comparisons with previous experimental results at the same scale. We found that the new dimensionless parameters can describe the whole growth region as initial and later (thermal) respectively. The comparisons showed good agreement in the initial and thermal growth regions. In the initial growth region including surface tension controlled, transition and inertia controlled regions as divided by Robinson and Judd, the bubble growth rate showed that the bubble radius was proportional to $t^{2/3}$ regardless of working fluids and heating conditions. And in the thermal growth region as also called asymptotic region, the bubble showed a growth rate that was proportional to $t^{1/5}$, also. Those growth rates were slower than the growth rates proposed in previous analytical analyses. The required heat flow rate for the volume change of the observed bubble was estimated to be larger than the heat flow rate measured at the wall. Heat, which is different from the instantaneous heat supplied through the heating wall, can be estimated as being transferred through the interface between bubble and liquid even with saturated pool condition. This phenomenon under a saturated pool condition needs to be analyzed and the data from this study can supply the good experimental data with the precise boundary condition (constant wall temperature).

주제어

#폴핵비등   #단일기포   #기포성장   #미세히터   #초기성장영역   #열적성장영역  

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참고문헌 (23)

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이 논문을 인용한 문헌 (3)

1. Kim Jeong bae ; Lee Han Choon ; Kim Moo Hwan 2005. "Wall Superheat Effect on Single Bubble Growth During Nucleate Boiling at Saturated Pool" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 29(5): 633~642  원문보기 상세보기
2. Kim Jeong Bae ; Lee Han Choon ; Kim Moo Hwan 2005. "Study on the characteristics During Saturated Pool Nucleate Boiling of Refrigennt Binary Mixtures" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. B. B, 29(5): 643~652  원문보기 상세보기
3. 2006. "" Journal of mechanical science and technology, 20(5): 692~709  원문보기 상세보기